Both sites are preparing new login features. 



Google has made an [announcement explaining the reasons behind the 2 steps login process][1]

> Today, you sign in to Google on a page that includes both the ‘email’
> and ‘password’ fields on the same page. We’ll be gradually splitting
> those two fields into separate pages in the coming days; the sign-in
> process won’t change otherwise.
> 
> As we’ve said many times, we're working towards introducing new
> authentication solutions that complement traditional passwords. We’ve
> already separated the ‘username’ and ‘password’ fields onto separate
> pages on a successful launch in Android last year. This change to our
> web sign-in page is another step in that direction.
> 
> To help make sign-in easier and more personal, you may see a screen
> with your profile picture and full name when signing in to Google.
> We’ll only show this information if you are signing in from a location
> or device you’ve signed in from before, like your home computer.
> 
> 
[![enter image description here][2]][2]
> 
> 
> 
> 
> This new Google account sign-in flow will provide the following
> advantages:
> 
> Preparation for future authentication solutions that complement
> passwords Reduced confusion among people who have multiple Google
> accounts A better experience for SAML SSO users, such as university
> students or corporate users that sign in with a different identity
> provider than Google


  [1]: https://productforums.google.com/forum/m/#!category-topic/gmail/oAsE-6wmaSU
  [2]: https://i.sstatic.net/56s9x.png